Chuck.



" PATEN'TED DEGLl, 1903.

J. JEGKLIN.

CHUCK.

APPLIOATION FILED JULY 5, 1902.

(Im-QM; wf

No MODEL.

m llillllll UNITED STATES 'Patented December 15, 1903.

` PATENT OFFICE.

JACOB JECKLIN, or DUBUQUE, IOWA, Assienon on ONE-HALF To orrARLEs w.sonnninajor DUBUQUE, IowA.

CHUCK.

sPEcIFIcATIoN forming-pam f Letters Patent "No, 746,707, dated December15, 190e. Application ledil'uly 5, 1902. Serial No. 114.43'i. (liomodel.) n

To a/ZZ whom t may concern,.-

Beit known that I, JACOBJECKLIN, a citizen of the United States,residing in the city and county of Dubuque and State of Iowa,

have invented certain' new and useful'Improvements in Chucks; and' I dohereby declare the following to be a full, clear, and exf actdescription of the invention, which will enable others skilledin the artto which it appertains to make and use the same.

My invention relates to stock-holding or work chucks, with specialreference to those having two jaws used'with'turret-lathes and adaptedto rotate ata high rate of speed with there will be a minimum lossintime in changing the work and the work will be uni'- formly presentedtothe cutter.

A further object isto so construct the chuck that its weightshall be asnear as possible to the center of rotation, whereby the chuck, with thework therein, can be rapidly rotated in one direction and then eithersuddenly stopped or reversed with the least possible g strain on thelathe or power which operates it.

y through line X X of Fig. l.

Like letters ofreference denote corresponding partsin'each of thedrawings. l Referringnow to the drawings,A designates the casing or bodyof the chuck,which may be the chips with the constructed in two partsand bolted together or cast in a single piece, having the sides ab c,with the sidesband c, terminating attheir upper edges in plates B. Theseplates B are somewhaty wider than the thickness of the sides Z) and cand form projecting ledges or guides d on both sides of h and c at theirupper edges for the purposes presently to appear.

The lower part of the casing A terminates in a hollow shank D, which isscrew-threaded on its `inner end, by which it is adapted to be attachedto the spindle of a turning-lathe.

vThe jaws of the chuck are constructed in one piece `and consist of thegrasp'E, set upon a base terminating in a hook G along one end ,A of thebase F and adapted to grasp the outer ledge or guide e of the plates B.To the under side ofthe base F of the jaw is an arm AH, extendingforward'beneath the opposite the cap J and along in the recess I passesa bolt K,screwthreaded nearly its entire length and provided with. ahead k on its end outside of the cap J, to which bolts are attached thenut-rack L. These bolts K are held in the recess I by strapsj,attachedto the arms H. VIt will be observedfthat by this'mode ofconstructionthe Varm H ofeach jaw projects forward past the centerbeneath the-opposite jaw and the two arms ll the space between the twoplates B and the two faces E, thus preventing any chips of the workpassing into or clogging or in any manner interfering with the gear,presently to be described, for operating the jaws. Itwill'alsobeobserved that since the arms project inward past each otherand over the center beneath the opposite jawA the main weight of thejaws will be thrown'near the center instead of outward from the center,as wouldY be the case if the base of the jaws projected in the rear ofthe grasps. It will be still further observed, since each arm projectsbeneaththe opposite jaw,- that any strain or wrench of one jaw lwill beIOO transmitted to the opposite jaw, and hence the face of both jawswill always remain in parallel planes under whatever strain they may besubjected to. This is a great advantage, as by this mode of constructionthe work will always be presented uniformly to the cutters.

Within the casing beneath eacharm H is pivoted a pinion M, provided withteeth N, which teeth are adapted to mesh in with the teeth on thenut-rack L.

For the purpose of partially rotating the pinions M there is set adouble-toothed rack O, which engages with the teeth N on the pinions M.The opposite or outer end ofthe rack is screw-threaded, and thus adaptedto be secured to the pull-bar P. The outer end of the pull-barPisscrew-threaded, and there is secured thereon a screw-handle Q. Thepull-bar passes through the spindle C. To this spindle is attached thechuck. The spindle is rotated in the bearings S by power applied to thecone-pulley T. It will be seen by this mode of construction and settingthe jaws with their arms titted to slide in reverse ways past each otherand ad-apted to be moved past the center and beneath the face of theopposite jaw that the pinions for operating the jaw may be very smalland set close together near the center and the weight of the jaws, theweight of the pinions, and the weight of the operating-gear will all benear the centerof rotation and when the chuck is rapidly rotated therewill be the minimum of centrifugal force to overcome and the minimum ofstrain on the belt and power when the chuck is suddenly stopped orreversed in its rotation.

The manner of operating my device is substantially as follows: Theoperator, with a wrench applied to the head k of the bolt K, adjusts thejaws to the size of the work then to be operated upon, then places thework between the jaws, then grasps the handle Q and rotates it in onedirection, whereby the pull-bar P is drawn outwardly, and as it isattached to the double toothed rack O it draws the toothed rackoutwardly and rotates the pinions N by engagement of its teeth with theteeth of the pinion. This movement draws the grasping portions of thejaws toward yeach other and causes them to grip the work rigidly by theteeth N, engaging with the nutrack L, and at the same time the arms Hare torcedin the same parallel plane to each other and across the centerof rotation and beneath the opposite jaw, and as the arms are a part ofthe jaws any strain upon one jaw will be transmitted to the graspingportion of they which draws the double-toothed rack O outwardly androtates the pinions N, which releases the grasp of the jaws upon theWork by the engagement of the teeth of the pinion N with the nut-rack L.

The details of construction may be Varied within a wide range withoutdeparting from the spirit of my invention.

What I claim, and desire to secure by Letters Patent, is-

l. In a chuck, a casing provided at one side with means for connectionwith a lathe-spindle and having a longitudinal recess in its oppositeface, a pair ot' jaws upon the recessed face of the casing andadjustable toward and away from one another, arms carried by the jawsand lying in the recess, each arm being in frictional engagementthroughout its entire length with the other arm upon its inner face andalso projected beneath the opposite jaw, said arms closing the outeropen side of the recess.

2. In a chuck, a casing provided at one side with means for connectionwith a lathe-spindle and having a longitudinal recess in its oppositeface, guides atopposite sides of the recess, jaws mounted to slide onthe guides, and arms carried by the jaws and working in the recess, eacharm being in frictional engagement throughout its entire length withVthe other arm upon its inner face and also projected beneath theopposite jaw, said arms closing the outer open side of the recess.

3. In a chuck, a casing provided at one side with means for connectionwith a lathe-spindle and having a longitudinal recess in its oppositeside, jaws adjustable toward and away from one another upon the recessedside of the casing, arms carried by the jaws and working in the recess,each arm beingin frictional engagement throughout its entire length withthe other arm upon its inner face and also projected beneath theopposite jaw, said arms closing the outer open side of the recess, andmeans located within the recess and beneath the arms for adjusting thejaws.

4. In a chuck, a casing provided at one side with means for connectionwith a lathe-spindle and having a longitudinal recess in its oppositeface, jaws adjustable toward and away from one another upon the recessedside of the casing, arms carried by the jaws and working in the recess,each arm being in frictional engagement throughout its inner face withthe inner face of the other arm and also projected beneath the oppositejaw, said arms closing the outer open side of the recess, racks upon theunder sides of the arms, and adjusting-pinions mounted within the recessand in engagement with the respective racks.

5. In a chuck, a casing, jaws each provided with an arm to move withinthe casing in opposite directions and projected beneath the oppositejaw, and-means for operating the jaws consisting of pinions engaging thearms and a double-toothed rack engaging the pinions.

6. In a chuck, a casing, guides in the cas- IIO ing, jaws each providedwith an arm engaging and traveling in one of the guides and beneath theother jaw, and means for moving` the jaws with their arms in reversedirections, said means consisting of pinions engaging each jaw and adouble-toothed rack engaging the pinions.

7. In a chuck, a casing, guides in the casing, jaws each provided with agrasping-face engaging the guides and also provided with an armprojected beneath the opposite jaw and working in one of the guides, andmeans for adjusting the jaws consisting of pinions to engage the jawsand a doub1e toothed rack to engage the pinions.

8. In a chuck, a casing, guides in the casing, jaws each consisting of agraspingface and an arm movable in the casing and projected beneath theopposite jaw, a screw attached to each jaw for adjusting the position ofthe jaw relative to the work, a rack attached to each screw, pinionsengaging the respective racks, and a double-toothed ,rack

engaging the pinions t0 si muitaneously adj ust the' jaws. j

9. In a chuck, a casing provided with a 1ongitudinal recess, externalguides upon the casing and at opposite sides of the recess, internaiguides within the recess .and at opposite sides thereof, jaws havinggrasping portions slidabiy engaging the external guides, arms carried bythe jaws and working in the recess in engagement with the internalguides,

each arm being projected beneath the oppo.

sitejaw and in frictionai engagement throughout its inner face with theotherarm, said arms closing the outer open side of the recess, and meansfor adjusting the jaws. y

l0. In a chuck, a casing provided with outside and inside guides, jawsslidably mounted on the outside guides, each jaw .having an armprojected beneath the opposite jaw and working upon the inside guides, ascrew carried by eachjaw for adjusting the position thereof, a rack oneach screw, and means engaging the racks for operating the same toadjust the jaws with their arms simultaneously in reverse directions.

ll. In a chuck, a casing provided with outside and inside guides, jawsmounted to slide upon the outside guides, arms carried by the jaws andworking upon the inside guides, each arm being projected beneath theopposite jaw, a screw on each jaw, a rack upon each screw, a pinionengaging each rack, and a double-toothed rack engaging the pinions forsimultaneously adjusting the jaws in reverse directions. j

l2. In achuck, acasingprovided withalongitudinal recess, outside guidesat opposite' sides of the recess, inside guides within the recess and atopposite sides thereof, jaws mounted to slide upon the outside guides,arms carried bythe jaws and working within the recess in engagement withthe inside guides, each arm being in frictional engagement throughoutits inner side with the other arm and projected beneath the oppositejaw, said arms closing the outer open side ofthe recess, and means foradjusting the jaws consisting of pinions engaging the arms and adouble-toothed rack engaging the pinions.

In testimony whereof I have signed my name to this specification in thepresenceof two subscribing witnesses.

v JACOB JECKLIN. Witnesses:

M. M. GABY, E. B. LAKE.

